DP Biology (last assessment 2024)
Question 18M.3.SL.TZ1.18b
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.SL.TZ1.18b |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Outline | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18M.3.SL.TZ1.18b
(b)
Outline control of digestive juice secretion so that digestive juices are only secreted into the gut when there is food present.
[2]
Markscheme
a. combination of nervous AND hormonal control
b. food in stomach stimulates chemoreceptors/stretch receptors / stretches the wall
c. causes production of gastrin
d. arrival of chyme to the small intestine triggers the release of hormones/secretin
e. volume and composition of gastric juices are controlled
